Which sentence best describes diatoms?
a. They are unicellular and autotrophic.
b. They are multicellular and heterotrophic.
c. They are unicellular and heterotrophic.
d. They are multicellular and parasitic.
Answer: a. They are unicellular and autotrophic.
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In a GWAS experiment, 500,000 SNPs across the genome are genotyped in thousands of Case and Control individuals. Which statistical analysis should be applied and why?
A) A chi-square test for goodness of fit will test the null hypothesis that the distribution of each SNP allele is the same in Cases and Controls. B) A chi-square test for goodness of fit can be used because this is a small number of SNPs. C) A chi-square test for independence should be used to test the null hypothesis that the distribution of each SNP allele is the same in Cases and Controls. D) A chi-square test for independence should be used to test the null hypothesis that each SNP is linked to a QTL.
Barringer Crater in Arizona was formed when
a 300,000-ton asteroid slammed into Earth 50,000 years ago. Which of the following is true about this event? a. It hit so early that it had little influence on the history of life. b. This one produced about 150 times the energy of the bomb that hit Hiroshima. c. Its impact produced a minor crater. d. Scientists recently disproved that an asteroid impacted our planet just prior to the mass extinctions at the K-T boundary. e. An asteroid impact releases only minor amounts of energy.
Traits that are controlled by more than one gene are called
a. codominant. b. pleiotropic. c. polygenic. d. penetrant. e. independent
Java man and Peking man are both examples of Homo ________.
Fill in the blank(s) with the appropriate word(s).